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O B Curtis Water Treatment Plant

Water Supply, Ridgeland, Mississippi. NPDES permit MS0046906 expired Aug 31, 2026; its limits still apply. Last 12 months: over a limit 26 times (last August 2026), 1 of 11 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (32 values)
Last report on file
August 2026
Oct 2024 – Sep 2025
28 values over a limit, 0 required values missing, 0 of 12 reports late

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

All 26 values over a limit
Period endingParameterReportedLimitOver by
October 2025Solids, total suspended, maximum monthly average230.4 mg/L≤ 45 mg/L412%
October 2025Solids, total suspended, weekly maximum308 mg/L≤ 67.5 mg/L356%
November 2025Solids, total suspended, weekly maximum80 mg/L≤ 67.5 mg/L19%
December 2025Solids, total suspended, maximum monthly average56.4 mg/L≤ 45 mg/L25%
December 2025Solids, total suspended, weekly maximum128 mg/L≤ 67.5 mg/L90%
January 2026Solids, total suspended, maximum monthly average1082.03 lb/d≤ 1073 lb/d1%
January 2026Solids, total suspended, maximum monthly average119.5 mg/L≤ 45 mg/L166%
January 2026Solids, total suspended, weekly maximum260 mg/L≤ 67.5 mg/L285%
January 2026Solids, total suspended, weekly maximum3361.02 lb/d≤ 1609 lb/d109%
February 2026Solids, total suspended, maximum monthly average236.25 mg/L≤ 45 mg/L425%
February 2026Solids, total suspended, maximum monthly average3453.57 lb/d≤ 1073 lb/d222%
February 2026Solids, total suspended, weekly maximum460 mg/L≤ 67.5 mg/L581%
February 2026Solids, total suspended, weekly maximum8708.63 lb/d≤ 1609 lb/d441%
March 2026Solids, total suspended, maximum monthly average223.5 mg/L≤ 45 mg/L397%
March 2026Solids, total suspended, weekly maximum366 mg/L≤ 67.5 mg/L442%
April 2026Solids, total suspended, maximum monthly average336.5 mg/L≤ 45 mg/L648%
April 2026Solids, total suspended, weekly maximum1721.38 lb/d≤ 1609 lb/d7%
April 2026Solids, total suspended, weekly maximum950 mg/L≤ 67.5 mg/L1307%
July 2026Solids, total suspended, maximum monthly average1406.42 lb/d≤ 1073 lb/d31%
July 2026Solids, total suspended, maximum monthly average69.75 mg/L≤ 45 mg/L55%
July 2026Solids, total suspended, weekly maximum194 mg/L≤ 67.5 mg/L187%
July 2026Solids, total suspended, weekly maximum4077.26 lb/d≤ 1609 lb/d153%
August 2026Solids, total suspended, maximum monthly average1444 mg/L≤ 45 mg/L3109%
August 2026Solids, total suspended, maximum monthly average9775.81 lb/d≤ 1073 lb/d811%
August 2026Solids, total suspended, weekly maximum19320.44 lb/d≤ 1609 lb/d1101%
August 2026Solids, total suspended, weekly maximum2860 mg/L≤ 67.5 mg/L4137%

Limits in force (32)

ParameterStatisticLimitMonths
BOD, 5-day, 20 deg. Cmaximum monthly averagereport only (mg/L)all year
BOD, 5-day, 20 deg. Cweekly maximumreport only (mg/L)all year
BOD, 5-day, 20 deg. Cmaximum monthly averagereport only (lb/d)all year
BOD, 5-day, 20 deg. Cweekly maximumreport only (lb/d)all year
pHminimum≥ 6 SUall year
pHmaximum≤ 9 SUall year
Solids, total suspendedmaximum monthly average≤ 45 mg/Lall year
Solids, total suspendedweekly maximum≤ 67.5 mg/Lall year
Solids, total suspendedmaximum monthly average≤ 1073 lb/dall year
Solids, total suspendedweekly maximum≤ 1609 lb/dall year
Nitrogen, total [as N]maximum monthly averagereport only (mg/L)all year
Nitrogen, total [as N]weekly maximumreport only (mg/L)all year
Nitrogen, total [as N]maximum monthly averagereport only (lb/d)all year
Nitrogen, total [as N]weekly maximumreport only (lb/d)all year
Nitrogen, ammonia total [as N]maximum monthly averagereport only (mg/L)all year
Nitrogen, ammonia total [as N]weekly maximumreport only (mg/L)all year
Nitrogen, ammonia total [as N]maximum monthly averagereport only (lb/d)all year
Nitrogen, ammonia total [as N]weekly maximumreport only (lb/d)all year
Phosphorus, total [as P]maximum monthly averagereport only (mg/L)all year
Phosphorus, total [as P]weekly maximumreport only (mg/L)all year
Phosphorus, total [as P]maximum monthly averagereport only (lb/d)all year
Phosphorus, total [as P]weekly maximumreport only (lb/d)all year
Flow, in conduit or thru treatment plantmaximum monthly averagereport only (MGD)all year
Flow, in conduit or thru treatment plantweekly maximumreport only (MGD)all year
Chlorine, total residualmaximum monthly averagereport only (mg/L)all year
Chlorine, total residualweekly maximumreport only (mg/L)all year
Chlorine, total residualmaximum monthly averagereport only (lb/d)all year
Chlorine, total residualweekly maximumreport only (lb/d)all year
Solids, total dissolvedmaximum monthly averagereport only (mg/L)all year
Solids, total dissolvedweekly maximumreport only (mg/L)all year
Solids, total dissolvedmaximum monthly averagereport only (lb/d)all year
Solids, total dissolvedweekly maximumreport only (lb/d)all year

How strict are these limits?

Cited limits by parameter: Mississippi's rules and the federal ones.

Same industry: the 23 Water Supply permits in Mississippi.

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On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/MS0046906 · MCP: https://passage-data.com/mcp